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Magnetic Resonance in Medicine
Article . 2017 . Peer-reviewed
License: Wiley Online Library User Agreement
Data sources: Crossref
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Fully phase‐encoded MRI near metallic implants using ultrashort echo times and broadband excitation

Authors: Curtis N, Wiens; Nathan S, Artz; Hyungseok, Jang; Alan B, McMillan; Kevin M, Koch; Scott B, Reeder;

Fully phase‐encoded MRI near metallic implants using ultrashort echo times and broadband excitation

Abstract

PurposeTo develop a fully phase‐encoded MRI method for distortion‐free imaging near metallic implants, in clinically feasible acquisition times.Theory and MethodsAn accelerated 3D fully phase‐encoded acquisition with broadband excitation and ultrashort echo times is presented, which uses a broadband radiofrequency pulse to excite the entire off‐resonance induced by the metallic implant. Furthermore, fully phase‐encoded imaging is used to prevent distortions caused by frequency encoding, and to obtain ultrashort echo times for rapidly decaying signal.ResultsPhantom and in vivo acquisitions were used to describe the relationship among excitation bandwidth, signal loss near metallic implants, and T1 weighting. Shorter radiofrequency pulses captured signal closer to the implant by improving spectral coverage and allowing shorter echo times, whereas longer pulses improved T1 weighting through larger maximum attainable flip angles. Comparisons of fully phase‐encoded acquisition with broadband excitation and ultrashort echo times to T1‐weighted multi‐acquisition with variable resonance image combination selective were performed in phantoms and subjects with metallic knee and hip prostheses. These acquisitions had similar contrast and acquisition efficiency.ConclusionsAccelerated fully phase‐encoded acquisitions with ultrashort echo times and broadband excitation can generate distortion free images near metallic implants in clinically feasible acquisition times. Magn Reson Med 79:2156–2163, 2018. © 2017 International Society for Magnetic Resonance in Medicine.

Keywords

Knee Joint, Phantoms, Imaging, Radio Waves, Reproducibility of Results, Prostheses and Implants, Magnetic Resonance Imaging, Imaging, Three-Dimensional, Metals, Image Processing, Computer-Assisted, Humans, Hip Joint, Arthroplasty, Replacement, Artifacts

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    influence
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
10
Top 10%
Average
Top 10%
bronze